获取Apache的空白PHP页面

Question

In a newly setup digitalOcean cloud server (CentOS), I have installed php and Apache. The webserver is running fine:

[root@a2m5cent01 httpd]# service httpd status
httpd (pid  11232) is running...
[root@a2m5cent01 httpd]# php --version | head -1
PHP 5.3.3 (cli) (built: Dec 11 2013 03:29:57) 

But browser is showing blank pages (white page) if I try to visit any php page.

Here is what I have done so far to troubleshoot:

1. Created a page with following content: <?php phpinfo(); ?> <?php phpinfo(); ?> . It displays a blank page when viewed from browser.
2. Just to ensure, apache is pointing to the correct directory, placed a static .html page there, and saw it comes out fine in browser, so apache is working and directory is correct.
3. In /etc/php.ini , changed display_errors directive to On . Still blank page
4. In Apache config file ( /etc/httpd/conf/httpd.conf ) found this line Include conf.d/*.conf . Inside conf.d directory, there is a php.conf file containing the line: LoadModule php5_module modules/libphp5.so . Ensured that this .so file actually exists in this place.
5. In the same file I have these two lines as well: AddHandler php5-script .php and AddType text/html .php
6. Executed the php page from CLI, it works fine - so php is working locally.

Then why is it always shows a blank/white page over the browser? What else am I missing?

EDIT Based on suggestions from @Nathan,

1. I checked Apache error log file, could not see any error being reported there.
2. My /etc/php.ini says, php error_log is located as syslog . So I checked /var/log/messages but could not find any PHP error message
3. Next I put some normal HTML in the php file containing phpinfo() call. Interestingly I found that even the normal HTML texts are also not coming. It still produces blank page.
4. Then I checked Apache access log. Surprise! There is no GET request for any of the PHP files I tried to load in the browser. But GET request for all the non-php files are there with 200 return code.

Apache is not even logging any access request for PHP files. Any idea why would that happen?

Answer 1

check out your phpinfo() script.

<?php
phpinfo();
?>

missing the "php" behind the first "?" will give a blank page

Answer 2

I think your php installation with apache is faulty. Thats why you can not see any php page in your webserver. Clean remove all the existing apps, like httpd,php,php-fpm,php-cli etc. and try to clean isntall in this order

yum install httpd -y
yum install php php-common php-cli php-gd php-curl php-fpm -y

then make sure you restart yout httpd server.

service httpd restart

Install mod_fastcgi:

yum install  mod_fastcgi

Start the service:

service php-fpm start

Restart Apache:

service httpd restart

5. Configuration of Apache with PHP-FPM

Open the fastcgi.conf file:

nano /etc/httpd/conf.d/fastcgi.conf

Add this to the end of the file:

<IfModule mod_fastcgi.c>
                DirectoryIndex index.html index.shtml index.cgi index.php
                AddHandler php5-fcgi .php
                Action php5-fcgi /php5-fcgi
                Alias /php5-fcgi /usr/lib/cgi-bin/php5-fcgi
                FastCgiExternalServer /usr/lib/cgi-bin/php5-fcgi -host 127.0.0.1:9000 -pass-header Authorization
</IfModule>

After that search after "FastCgiWrapper" and make sure it's set to "off" then save the file.

The /usr/lib/cgi-bin/ directory must exist, so we create it:

mkdir /usr/lib/cgi-bin/ 

If mod_php is installed and enabled, we need to disable it so open the configuration at /etc/httpd/conf.d/php.conf:

nano /etc/httpd/conf.d/php.conf

Comment out the AddHandler and AddType lines so it looks like here:

#
# PHP is an HTML-embedded scripting language which attempts to make it
# easy for developers to write dynamically generated webpages.
#
<IfModule prefork.c>
  LoadModule php5_module modules/libphp5.so
</IfModule>
<IfModule worker.c>
  LoadModule php5_module modules/libphp5-zts.so
</IfModule>
#
# Cause the PHP interpreter to handle files with a .php extension.
#
#AddHandler php5-script .php
#AddType text/html .php
#
# Add index.php to the list of files that will be served as directory
# indexes.
#
DirectoryIndex index.php
#
# Uncomment the following line to allow PHP to pretty-print .phps
# files as PHP source code:
#
#AddType application/x-httpd-php-source .phps

Save the file and restart Apache:

service httpd restart

Answer 3

Are you navigating to the php file directly? Or are you just going to the directory root?

If the later, Apache might not be recognizing .php as the directory index.

To test, try create a .htaccess file in your web root containing the following line:

DirectoryIndex index.php

Answer 4

I have the same issue... The problem is in the iptables. ( It seems like it )

Try with:

service iptables stop
## check if it stop...
service iptables status

Then try to reload the page again.

If you had other solution please share.

[ edit ] Restarting the iptables service is working for me.

Try:

service iptables restart

Answer 5

First of all you should check the permissions of your file. If you don't grant read-permission to public, Apache produces a blank page without showing any errors.

Answer 6

Since everything looks at its default state, have you checked this part just for confirmation

cat /etc/php.ini | grep log_errors

If log_errors is disabled then enable it and check this below log after restarting httpd. /var/log/httpd/error_log

-- Also check this part from php configuration.
cat /etc/php.ini | grep error_reporting

This value should be enabled by default so that display_errors will work.
error_reporting = E_ALL

Answer 7

Sorry to repost an old thread...this is important.

I also was having these problems where no html response was outputting

After double-checking php.ini or my apache conf files and was still receiving no output, I later found out that I was suppressing the error of an include / require of a class, with @ , which was nested within a constructor function. There was a syntax error in the included file, which stopped all output altogether when errors were thrown.

So, check your handlers first. If you are storing all your output into vars first and you are including various scripts first that fail you'll have to see those errors. If you suppress file handler errors, you'll get a blank screen if you have a syntax error in the file.

Search your files for all instances of @ in your php code. Then turn @include "/path_to/script.php"; to include "/path_to/script.php"; or anything @$foo into $foo as such var might reference a dependency that is causing your script to end with nothing showing in the httpd error log or in the http response.

Answer 8

It's been sometime, but I wanted to come back to this question to update that the issue was with the directory permission setup.

The FPM user I was using didn't have necessary permission to execute the index.php file in the web root.

To avoid these issues in the future, I have created an automated bash script that will automatically create and configure webservers in DigitalOcean boxes. Please take a look here https://github.com/akash-mitra/fairy

This script will automatically,

• Installs Nginx
• Create virtual server block for nginx
• Installs PHP, PHP APC, PHP Curl etc.
• Supports PHP Fast Process Manager (php-fpm)
• Installs Memcached
• Installs Database (MariaDB / MySQL)
• Optionally Installs PHP Composer and Laravel
• Configures and Strengthens SSH
• Activates Firewall
• Optionally enables SWAP space in DO server and fixes a locale issue